Personally I’d like to do a tour of Europe. It would be extra awesome if my two European friends could join up. Other than the obvious western Europe destinations, I’d like to visit Poland, Czech Republic, and Bosnia and Herzegovina in particular. I’m sure I’m forgetting a few others. One of my friends has been to a few other places; apparently Serbia’s great for nightlife, and if you aren’t too worried about venturing into a conflict-ridden area, Ukraine has some cool sights.
I did have another friend who was supposed to study abroad in Egypt. I would have been jealous, except political tensions were super high at the time. Morocco always seemed interesting as well.